Ubuntu - Networking - ARP - Add an entry in ARP cache Table

arp  -s  192.168.1.43  12:48:08:bb:a5:bb

Make sure the IP address is a valid one in the above command.

Add multiple entries to the ARP cache table at once

The arp utility supports taking entries from a file.

Simply pass the file path as an argument to arp command.

By default the /etc/ethers file is used.

The file content should look like this:

12:f7:fd:48:aa:79 192.168.1.40
12:48:08:aa:a5:bb 192.168.1.43

Now you can give the path of the file as argument.

arp -f /etc/ethers